medium · Enhanced ACT reading
A study showed that people who drink green tea regularly have a lower risk of heart disease. The researchers concluded that the antioxidants in the tea protect the heart.
Which of the following, if true, identifies a 'common cause' confound for this claim?
- Antioxidants are known to neutralize free radicals that can damage cells throughout the entire human body.
- The study included 10,000 participants from five different countries, making it the largest tea study ever conducted.
- Individuals who drink green tea are also more likely to engage in regular exercise and follow a balanced diet.
- Green tea contains exactly zero calories if consumed without added sugar or honey, making it a popular diet drink.
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